Angelina Jolie Was 'Shocked and Worried' About Son Pax's Accident but He Got 'Very Lucky' (Exclusive Source)

Pax Jolie-Pitt remains in recovery after his July 29 e-bike accident in Los Angeles.

A source tells PEOPLE that Angelina Jolie and Brad Pitt's 20-year-old son is "still recovering," days after he was released from an ICU ward in L.A.

"He's uncomfortable and will need further treatments. Still, he was very lucky," the source says. "It could have been much worse since he didn't wear a helmet."

Pax was hospitalized after the July 29 incident, which happened in an area of Los Feliz Boulevard.

"Angie was shocked and worried when she got the call about the accident," the source adds of Jolie, 49, while noting that her other five kids "are supporting Pax as best as they can."

A source previously told PEOPLE on Aug. 5 that Pax had been released from an ICU ward and noted that he "suffered complex trauma and now begins the long road of recovery and physical therapy."

At that time, the source said both Pax and Jolie "are deeply grateful for the quick and life-saving action of first responders, and the outstanding medical care he received."

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The insider also said Jolie remained by his side during his hospital stay, while Pax's siblings — Maddox, 22, Zahara, 19, Shiloh, 18, and 16-year-old twins Knox and Vivienne — "have been visiting and helping."

Jolie recently worked with Pax and Maddox on her upcoming film Without Blood, which she directed; Pax and Maddox worked on the movie's crew. Without Blood is expected to make its world premiere at the Toronto International Film Festival in September.